Improvement in promoting combustion in furnaces



I. C. TIFFANY.

Promoting Combustion in Furnaces. N0. 163,547. I Patented May18,1875.

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UNITED STATES ATEN'I OFFICE.

JOSEPH CAPRON TIFFANY, OF PORTSMOUTH, NEW HAMPSHIRE.

IMPROVEMENT IN PROMOTING COMBUSTION IN FURNACES.

Specification forming part of Letters Patent No. 163,547, dated May 18,1875 application filed May 10, 1875.

To all whom it may concern:

Be it known that I, J OSEPH CAPRON TIF- FANY, of Portsmouth, in thecounty of Rockingham and State of New Hampshire, have invented certainnew and useful Improvements in Promoting Combustion in Furnaces, ofwhich the following is a specification:

This invention relates to a new and improved method of promotingcombustion in furnaces, and apparatus for carrying the same into effect,its object being to furnish an effectual means of increasing thecombustion of the fuel and intensifying the heat in the furnace.

My invention consists in an improved method of promoting combustion andintensifying the heat in furnaces by admitting to the same,simultaneously, a current of carbonic oxide and hydrogen gas, and heatedair or steam, in such manner that the two will commingle and mix as theyescape into said furnace, and unite with and consume the products ofcombustion arising from the burning fuel, as hereinafter more fullydescribed.

In the drawings, Figure 1 represents a sectional view of the fire-box ofan ordinary tubular boiler, showing the different forms of my invention.Fig. 2 is a perspective View. Fig. 3, a detached view of one of thedouble pipes for supplying the gas and air to the furnace; Fig. 4, atransverse sectional view of one of the double pipes; Fig. 5, anelevation of the box or chamber and gassupply pipes, and Fig. 6represents a longitudinal section through the triangular box.

The letter A represents the fire-box of the boiler, and B the grate-barsof the same. 0 represents a double pipe, through the portion 0 of whichheated air is forced by means of a fan, D, or other blast apparatus,carbonic oxide, and hydrogen gas, the two being admitted through thebranch 0 of said double pipe. The above-named gases and heated air arein this manner mixed as they escape into the furnace, burning with anintense heat, and consuming the products of combustion arising from theburning fluid.

It is evident that various modifications of the above device may beemployed with advantage in connection with the furnace. For instance,the gas-supply pipe may extend entirely through the outer pipe andterminate in a rose-jet, E, just beyond the end of the same in thefurnace; or said outer pipe may be formed with a series of apertures atsuitable intervals along the same, through which project a series ofsmall pipes from the inner pipe, having an annular opening around saidpipes for the escape of the heated air.

Instead of the outer pipe, a chamber or box, Gr, may be employed, thesame being arranged just above the grate-bars, and having an open bottomfor the admission of air. A pipe, G, leading from a gas-holder, H,extends up into said chamber, terminating in branch pipes I, whichproject through apertures somewhat larger than the same in the upperpart of said chamber, in order to carry a current of air along with thegases introduced into the furnace, and the gases and air are mixed asthey enter, as before. A modification of this lastmentioned device isrepresented by the letter K, which consists in a triangular box, with alongitudinal slot along its top, having a perforated pipe extendingthrough the same, and communicating with the gas -holder. Said box hasan open bottom for the admission of air to the same. The burning fuel,by heating said box, insures the thorough heating of the air beforeentering the furnace.

The pipes employed are made of platinum or its alloys, or of othermetals, coated or plated with platinum or its alloys, in order to resistthe intense heat and the action of the steam and gases. Through theinner pipes a current of hydrogen and carbonic-oxide gas is admitted tothe furnace, and through the outer a current of heated air. The innerpipe is made considerably smaller than the outer, leaving an annularspace for the passage of the air or steam, and the inner pipecommunicates with the furnace through a series of short tubes projectingthrough apertures somewhat larger in the outer pipe, annular spacesbeing thus formed around them, through which the heated air can escapeinto the furnace.

It will be seen that the gases and heated air or steam are thus passedinto the products of combustion in the furnace together, and commingledas they escape, insuring the most perfect combustion.

Steam may be admitted through the inner tubes instead of the gases, inwhich case the small tubes are made to project somewhat beyond the Wallsof the outer tube, in order that the steam may become superheated beforeentering the furnace.

Having thus described my invention, What I claim, and desire to secureby Letters Patent, is

The method herein described of promoting combustion and intensifyingheat in furnaces, by simultaneously admitting; hydrogen andcarbonic-oxide gases and heated air to the same, and commingling andmixing the two at the moment they enter the furnace, substantially asdescribed.

In testimony that I claim the foregoing I have hereunto set my hand.

JOSEPH OAPRON TIFFANY. Witnesses:

JAMES L. NORRIS, A. H. N oRRIs.

